/*box3 beg*/
.box3{
    width: 500px;
    height: 400px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}
.conUl{
    width: 2500px;
    height: 200px;
    margin-top: 40px;
    /*transition: all 1s 0.5s linear;*/
}
.conUl li{
    float: left;
}
.conUl li a{
    width: 100%;
    height: 100%;
}
.pointUl{
    position: absolute;
    left:50%;
    transform: translateX(-50%);
    bottom: 65px;
}
.pointUl li{
    width: 20px;
    height: 20px;
    background-color: darkgray;
    border-radius: 20px;
    float: left;
    margin-right: 20px;
}
.box3 .playBut{
    position: absolute;
    width: 30px;
    height: 60px;
    background-color: darkgray;
    font:bolder 55px/60px "黑体";
    color:white;
    opacity:0.6;
    cursor: pointer;
}
.box3 .playBut.nextBut{
    right:0;
    top:62%;
    transform: translateY(-50%);
}
.box3 .playBut.preBut{
    left:0;
    top:62%;
    transform: translateY(-50%);
}